ASUS RT-AC87U WiFi client association failures?

I'm trying to troubleshoot some issues with intermittent wifi connectivity. After a few days of the router being up (10 days currently), my Raspberry Pi 4, running the latest Libreelec OS, will lose 5Ghz connection and fail to associate. If I reboot the pi it still won't connect however rebooting the router solves it. The router is on merlin firmware 384.13_10.

I don't see anything related in the router log despite it being set to...

ASUS RT-AC87U WiFi client association failures?